Elasticsearch Version

8.8.1

Installed Plugins

No response

Java Version

bundled

OS Version

ESS

Problem Description

The reroute processor allows to specific Mustache like syntax for field references. In contrast to other processors (.e.g set or rename) the variable does not allow to include spaces between the field name and the curly brackets.

This doesn't work:

"dataset": "{{ _reroute.dataset }}" 

while this does:

"dataset": "{{_reroute.dataset}}" 

Steps to Reproduce

PUT _ingest/pipeline/reroute_example { "processors": [ { "reroute": { "tag": "example", "dataset": "{{ _reroute.dataset }}" } } ] } POST logs-test.original-default/_doc?pipeline=reroute_example { "_reroute": { "dataset": "test.reroute" }, "@timestamp": "2023-06-20" } 

Notice how the target Data Stream is logs-test.original-default instead of logs-test.reroute-default

Logs (if relevant)

No response